Rl Flowmaster Garden - Recent Questions, Troubleshooting & Support

have not seen that make here . try where you got it

like most pumps; air, hydraulic, etc. there is a one-way valve with a ball or flap mechanism. If a small particle gets stuck preventing it from sealing, it'll leak pressure preventing it from building up. an easy way to try to clean this valve is to apply some air pressure to the hose end of the sprayer while operating the handle. your instruction booklet may cover this.

in the hardware store

Make sure the tank pressure release is shut, or make sure the rubber o-ring under the pump is there. You should feel back pressure after a few pumps.